Chuck



s. "(EARL "Nov. 18, 1930.

CHUCK Filed June 30, V 1924 mmvrox;

panding bushing; and

Patented Nov. 18, 1930 UNITED STATES PATENTIOFFICE ,SCHUYLER H. EARL, or ROCHESTER, NEW ironic, ASSIGNOR TOGLEASON woRxs, OF

ROCHESTER, NEW YORK, A CORPORATION on NEW YORK i CHUCK Application filed June so,

- The subject of the present invention isv an arbor or chucking device for securing Work pieces in position, and the invention relates more particularly to means for securing a gear to its spindle in a machine upon which same in positiononthe spindle, and which .may be released from its engaging position to permit removal fromflor placing on the spindle ofthe'gear without disconnection of the clamping means from the spindle. v

Other objects include the. provision 'in a chucking device, of means for quickly and securely clamping a work piece in position,

which is easy and economical to construct,

and which will not readily get out of order. v

With the above and other ob ects in view, my lnvention resides- 1n the novel arrange- -ment-and combination of par-ts andin the details of construction hereinafter described and claimed, it being specifically understood that the invention is not limited to the particular structure embodiedin the accompanying drawings and described in the specification, but that the structure may be modified *within' the limits of the'appended claims.

A practical embodiment of my invention is illustrated in the accompanying drawings,

in which F igu're 1 is-a side elevation, partly in section, of the clamping member expanded upon a spindle, so as to clamp a gear thereon;

Figure 2 is a side elevation, partly in section', of the clamping member in collapsed condition with the gear partly removed from the spindle;

Figure 3is a section on the line 3 3 of Figure 1;

Figure 4 is an end elevation of the exu is a ctional View Qt med fie clamp the same on- .the spindle.

1924.. Serial 1105723387.

Referring to the drawing by numerals of reference, I have shown atb a spindle or support of suitable structure upon which thegear or pinion 6 15 mounted. The spindle itself may be rnounted upon any suitable machine and is designed to support the gear for worlr thereon, for testing of the same,

' etc. As shown,the spindle is provided with,

a reduced outer end 7 forming a shoulder 8. The gear or pinion is mounted upon the reducedportion of thespindle and is adapted .to be moved thereon to seatone face against the shoulderIS. i f 7 To clamp the gear in position upon the spindle; I preferably employ an expanding member 10 comprising a cylindrical bushing split lengthwiseffor ,a portion otjits length to form a pluralityof arcuate lingers 11 provided at their outer ends with converging bearing faces 12 and 18. This bushing is adapted to be connected to the spindle and to'be expanded frcma collapsed position to a positionofengagement with the gear to For the purpose of expanding the bushing, the bushing maybe moved axially t0- ward the gear so that the -faces12 of the fingers are brought into contact with a co- ,operatingbeveled portion 14 of the spindle and are thus forced outwardly. Thisoutward expansion forces the bevel faces 13 of the fingers into secure engagement with a portion of the bore andthe outer face of .-the.gear and thus the gear is simultaneously locked against axial and rotational movement. p

Any suitable means maybe employed for supporting or connecting the bushing to the spindle. I preferably use for this purpose abolt 15, which is threaded into a recess 16 in the outer end of the spindle. For actuating the bushing so as to move the same axially to bring the fingers into engagement with the spindle and gear any suitable means,

may be employed. In the embodiment of the invention illustrated the bolt .15 serves this purpose, the bolt head 17 being of sufiicient diameter to force the bushingtoward the gear on threadingof the bolt.

" For the purpose Qt'perniitting ready re moval and placing of the gear on the spin dle or support, I preferably construct the bushing with a maximum diameter in collapsed condition less than the minimum diameter of thebore of the gear so that the gear may be removed from or placed on the spindle without disconnection of the bushing by sliding the gear over the collapsed bushing. Where a bolt, or similar means, is employed as the actuating member I preferably construct the head of the same, also, of less diameter than the minimum diameter of the bore of the gear so that partial unthreading of the bolt and collapsing of the bushing will permit ready removal from and replacement of the gear on the spindle. This structure speeds up work considerably as it is not necessary toj-remove and replace the clamping member each time a new gear is to be positioned or to be removed.

In the modification shown in Fig. 5, the

lengthwise cuts inthe bushing 10 are made of diiferent depths. It has been found that for certain purposes this construction provides a bushing of greater strength.

f To prevent chips or particles from enter-' ing between the fingers of the bushing when expanded, I may employ a sleeve 18 of the general type shown which is formed with an outwardly tapered portion at one end, and

which is adapted to be fitted over the bushing andto be moved axially thereon by the bolt as the bushing is moved into clamping position. The use of this sleeve, however, is not essential.

While I have used the term gear to describe the member which is to be clamped in place, it is to be understood throughout the specification and. claims that the term gear IS employed to designate a gear or p1n1on,

or in fact any member formed with a bore which it is desired to clamp upon a support which is adapted to enter the bore.

While I have described a particular structure, it is to be understood that my invention is not limited to the precise embodiment described but may be modified within the limits of the appended claims.

Having thus described my invention, what I claim is 1. A chuck forgearscomprising a spindle having a shoulderagainst which the inner end of a gear adapted to seat and a cylindr cal bearing portionwhich is of a diameter corresponding to the diameter of the. bore of thegear,.said bearing portionbeing adapted to enter the boreofthefgear andext'end to a point adjacent the outer. end face, of the gear to form the sole support for said gear, said bearing portion being tapered at its outer end to form a conical nose, and a split collet having fingers taperedv at their inner ends to engage-the. nose of the-Spindle to expand thecollet on axial movement of the same 1n one dlrection, and means adapted to be connected to said spindle for moving the collet axially, said collet when collapsed having a maximum diameter less than the mini mum diameter of the bore of the gear whereby the gear may be removed from the spindle without removing the collet, therefrom.

2. In a chuck,'the combination with a gear, a spindle having a tapered nose, a shoulder against which the backof the gear is adapted to seat and a portion adapted to enter the bore of the gear to support the same, the last named portion being cylindrical and of a diameter corresponding to'the diameter of the bore of the gear whereby the gear is centered on the spindle wholly by said cylindrical portion, of a collapsible bushing having tapered surfaces adapted to engage the nose of the spindle to expand the bushing to clamp the gear on the spindle anda cover surrounding said bushing adapted to protect said bushing against entrance of foreign matter between the parts of said bushing, said bushing when collapsed and said cover having maximum 'eiameters less than the minimum diameter of the bore of the gear to permit removal ofthe gear from the spindle with out disconnecting the bushing or cover therefrom. l I v 3. A chuck for gears comprising a spindle constructed to enter the bore of a gear to support the same andhaving' means thereon against which the inner end of the gear seats, a collapsible bushing, said bushing and spindle having'co-operating parts adapted to expand the bushing on axial movement thereof in one direction to clamp a gear on the spin dle, and means for moving the bushing axially of the spindle, the maximum diameter of the means for moving the bushing and of the bushing, when collapsed, being less than the minimum diameter of the bore of the gear whereby the gear may be removed from said spindle without removal of the bushing or the means forjmoving the same.

4. A chuck for gears comprising a supporting member having a shoulder against which the rear end of a gear is adapted to seat and a bearing portion adapted to enter the bore of a gear to support the same, said bearing portion having a tapered nose, a split collet having fingers tapered at their inner ends to engage the nose ofthe bearing portion so that when the collet is moved inwardly it is expanded, and a member having threaded engagement with said supportingmember and adapted to engage said collet to move the same axially, said collet when collapsed and said last named member being'ofa smaller diameter than the minimum diameter of the bore of the gear whereby the gear may be removed without removing the collet and last named member.

.5. In a chuck the combination with a gear and a spindle adapted to enter thebore of the gear to support the same, the portion of said spindle extending Withinthe bore of said gear being cylindrical and of a diame ter corresponding to the vdiameter of the bore of the gear for a part of its length and said spindle being provided with an outer beveled end, of an expansible bushing provided at its inner end with V-shaped faces adapted on axial movement of the bushing in one direction to contact with the beveled end of the spindle and the adjacent portion of the gear respectively to expand the bushing and to clamp the gear against axial and rotation movement on the spindle and means connected to the spindle and adapted to be moved in one direction to bring the bushing and spindle into engagement and to be moved in the opposite direction to permit collapse of said bushing, the maximum diameter of said means and of said bushing when c0llapsed being less than the minimum diameter of the bore of the gear whereby to permit removal of the gear from the spindle by drawing it over said means and bushingQ In witness, whereof, I have hereunto set my signature.

SCHUYLER H. EARL. 

